Surely Dilbert is letting the guy get away with this because he doesn't want to get on with his part of this project either - this way he has someone to hang the blame on................
I would just ask, every single day, 'You got that yet?' Or announce in front of Joe Worthless and his manager, 'Joe will have that done in a day or two, right Joe?
I can tell Dilbert is not a manager. If he was a manager, he would have demanded those changes be done by END OF DAY.
This sounds like most IT Projects I worked on at IBM. For one of our clients we have a brand new server cluster gathering dust while we wasted the last 2 years "stabilizing" the very old one we it was supposed to replace. Countless months working P1 calls and teams pushing back on getting this completed.